数字收音机.zip_am音频_audio am matlab_matlab模拟音频信号的AM调制与解调_收音机音频_模拟信号解调

function y = lvbo2(x) %LVBO2 Filters input x and returns output y. % MATLAB Code % Generated by MATLAB(R) 8.6 and the DSP System Toolbox 9.1. % Generated on: 30-Jan-2017 18:29:06 %#codegen % To generate C/C++ code from this function use the codegen command. % Type 'help codegen' for more information. persistent Hd; if isempty(Hd) % The following code was used to design the filter coefficients: % % Fstop1 = 5; % First Stopband Frequency % Fpass1 = 6; % First Passband Frequency % Fpass2 = 31; % Second Passband Frequency % Fstop2 = 32; % Second Stopband Frequency % Astop1 = 60; % First Stopband Attenuation (dB) % Apass = 1; % Passband Ripple (dB) % Astop2 = 80; % Second Stopband Attenuation (dB) % Fs = 441; % Sampling Frequency % % h = fdesign.bandpass('fst1,fp1,fp2,fst2,ast1,ap,ast2', Fstop1, Fpass1, ... % Fpass2, Fstop2, Astop1, Apass, Astop2, Fs); % % Hd = design(h, 'butter', ... % 'MatchExactly', 'stopband', ... % 'SystemObject', true); Hd = dsp.BiquadFilter( ... 'Structure', 'Direct form II', ... 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